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I did not mention that the 6mm thick 100mm CHS is braced at half height with 45 degree 35mm pipe.
So the pier size and the 80mm solid tapped riser is not a problem.
The stiffness of the mount connection is a function of the moment of the 100mm hollow mount base and the tension of the central bolt irrespective of the size or diameter of the plate it sits on. Hence my question. How tight is tight enough before there is a danger of stripping the alloy thread.?
I agree that rat cage bolts could have a slenderness ratio less than the 100mm hollow alloy base. Depends on the bolts. That can be calculated.
Plates are required to allow some azimuth fine tuning and to provide a 25 mm socket for the mount base. The ground here moves more than 1mm a year.
I can add a plate to achieve a 25mm solid base but the question of tension remains. Perhaps tapping the mount base for three screws from the bottom of the plate is the only way to increase the moment of resistance without overtension of the bolt.
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